665747537 has 16 divisors (see below), whose sum is σ = 845816832. Its totient is φ = 509751360.

The previous prime is 665747531. The next prime is 665747539. The reversal of 665747537 is 735747566.

It is a cyclic number.

It is not a de Polignac number, because 665747537 - 2⁴ = 665747521 is a prime.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (665747531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115178 + ... + 120819.

It is an arithmetic number, because the mean of its divisors is an integer number (52863552).

Almost surely, 2^665747537 is an apocalyptic number.

It is an amenable number.

665747537 is a deficient number, since it is larger than the sum of its proper divisors (180069295).

665747537 is a wasteful number, since it uses less digits than its factorization.

665747537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236048.

The product of its digits is 3704400, while the sum is 50.

The square root of 665747537 is about 25802.0839662226. The cubic root of 665747537 is about 873.1788132341.

The spelling of 665747537 in words is "six hundred sixty-five million, seven hundred forty-seven thousand, five hundred thirty-seven".